Awarded as the best online publication by CIDC

Marine Works

How does overflowing in trailing suction hopper dredger affect the water regime?

Trailing suction hopper dredger contains a large hopper for storage and transport of dredged materials. The dredging operation is implemented by a hydraulic dredging system including draghead, suction pip, pumps for taking up the material from seabed and putting them into the hopper.

Read More

Vertical drains can be installed in square and triangular patterns. Which pattern is better?

Vertical drains are commonly installed in square and triangular patterns. The zone of influence of vertical drains (R) is a function of drain spacing (S).

For drains in square pattern: R = 0.546S
For drains in triangular pattern: R = 0.525S

Read More

What is the purpose of providing shoes in prefabricated drains?

Shoes are normally installed in prefabricated drains for the following reasons:

(i) It avoids the entry of soils into the mandrel by sealing it during the installation of drains.

(ii) It performs like an anchor to retain the drains at the designed depth and to stop the drains from being pulled out during the withdrawn of mandrels after driving the mandrels into ground.

Read More

What are the considerations in selecting marine plants and land plants for installation of band drains?

For installation of band drains by marine plants, it must have sufficient water depth to accommodate the marine plants in the first place. However, due to the effect of tides and waves, the establishment of the position for installation of band drains and the subsequent installation works may be affected. In addition, the establishment cost of marine plants is higher than that of land plants.

Read More

For drained reclamation, what is the significance of smear zone induced by installation of band drains?

During installation of band drains, smear zones are created in which a zone of soil surrounding the band drains are disturbed. The compressibility of surrounding soils is increased and it results in the reduction of their permeability.

Read More

Ask a question